Nearest Terminal Color Calculator

256color.php

<?php

$CLUT = array(
  '00'  => array( 0,   0,   0   ), '01'  => array( 128, 0,   0   ),
	'02'  => array( 0,   128, 0   ), '03'  => array( 128, 128, 0   ),
	'04'  => array( 0,   0,   128 ), '05'  => array( 128, 0,   128 ),
	'06'  => array( 0,   128, 128 ), '07'  => array( 192, 192, 192 ),
	'08'  => array( 128, 128, 128 ), '09'  => array( 255, 0,   0   ),
	'10'  => array( 0,   255, 0   ), '11'  => array( 255, 255, 0   ),
	'12'  => array( 0,   0,   255 ), '13'  => array( 255, 0,   255 ),
	'14'  => array( 0,   255, 255 ), '15'  => array( 255, 255, 255 ),
	'17'  => array( 0,   0,   95  ), '18'  => array( 0,   0,   135 ),
	'19'  => array( 0,   0,   175 ), '20'  => array( 0,   0,   215 ),
	'22'  => array( 0,   95,  0   ), '23'  => array( 0,   95,  95  ),
	'24'  => array( 0,   95,  135 ), '25'  => array( 0,   95,  175 ),
	'26'  => array( 0,   95,  215 ), '27'  => array( 0,   95,  255 ),
	'28'  => array( 0,   135, 0   ), '29'  => array( 0,   135, 95  ),
	'30'  => array( 0,   135, 135 ), '31'  => array( 0,   135, 175 ),
	'32'  => array( 0,   135, 215 ), '33'  => array( 0,   135, 255 ),
	'34'  => array( 0,   175, 0   ), '35'  => array( 0,   175, 95  ),
	'36'  => array( 0,   175, 135 ), '37'  => array( 0,   175, 175 ),
	'38'  => array( 0,   175, 215 ), '39'  => array( 0,   175, 255 ),
	'40'  => array( 0,   215, 0   ), '41'  => array( 0,   215, 95  ),
	'42'  => array( 0,   215, 135 ), '43'  => array( 0,   215, 175 ),
	'44'  => array( 0,   215, 215 ), '45'  => array( 0,   215, 255 ),
	'47'  => array( 0,   255, 95  ), '48'  => array( 0,   255, 135 ),
	'49'  => array( 0,   255, 175 ), '50'  => array( 0,   255, 215 ),
	'52'  => array( 95,  0,   0   ), '53'  => array( 95,  0,   95  ),
	'54'  => array( 95,  0,   135 ), '55'  => array( 95,  0,   175 ),
	'56'  => array( 95,  0,   215 ), '57'  => array( 95,  0,   255 ),
	'58'  => array( 95,  95,  0   ), '59'  => array( 95,  95,  95  ),
	'60'  => array( 95,  95,  135 ), '61'  => array( 95,  95,  175 ),
	'62'  => array( 95,  95,  215 ), '63'  => array( 95,  95,  255 ),
	'64'  => array( 95,  135, 0   ), '65'  => array( 95,  135, 95  ),
	'66'  => array( 95,  135, 135 ), '67'  => array( 95,  135, 175 ),
	'68'  => array( 95,  135, 215 ), '69'  => array( 95,  135, 255 ),
	'70'  => array( 95,  175, 0   ), '71'  => array( 95,  175, 95  ),
	'72'  => array( 95,  175, 135 ), '73'  => array( 95,  175, 175 ),
	'74'  => array( 95,  175, 215 ), '75'  => array( 95,  175, 255 ),
	'76'  => array( 95,  215, 0   ), '77'  => array( 95,  215, 95  ),
	'78'  => array( 95,  215, 135 ), '79'  => array( 95,  215, 175 ),
	'80'  => array( 95,  215, 215 ), '81'  => array( 95,  215, 255 ),
	'82'  => array( 95,  255, 0   ), '83'  => array( 95,  255, 95  ),
	'84'  => array( 95,  255, 135 ), '85'  => array( 95,  255, 175 ),
	'86'  => array( 95,  255, 215 ), '87'  => array( 95,  255, 255 ),
	'88'  => array( 135, 0,   0   ), '89'  => array( 135, 0,   95  ),
	'90'  => array( 135, 0,   135 ), '91'  => array( 135, 0,   175 ),
	'92'  => array( 135, 0,   215 ), '93'  => array( 135, 0,   255 ),
	'94'  => array( 135, 95,  0   ), '95'  => array( 135, 95,  95  ),
	'96'  => array( 135, 95,  135 ), '97'  => array( 135, 95,  175 ),
	'98'  => array( 135, 95,  215 ), '99'  => array( 135, 95,  255 ),
	'100' => array( 135, 135, 0   ), '101' => array( 135, 135, 95  ),
	'102' => array( 135, 135, 135 ), '103' => array( 135, 135, 175 ),
	'104' => array( 135, 135, 215 ), '105' => array( 135, 135, 255 ),
	'106' => array( 135, 175, 0   ), '107' => array( 135, 175, 95  ),
	'108' => array( 135, 175, 135 ), '109' => array( 135, 175, 175 ),
	'110' => array( 135, 175, 215 ), '111' => array( 135, 175, 255 ),
	'112' => array( 135, 215, 0   ), '113' => array( 135, 215, 95  ),
	'114' => array( 135, 215, 135 ), '115' => array( 135, 215, 175 ),
	'116' => array( 135, 215, 215 ), '117' => array( 135, 215, 255 ),
	'118' => array( 135, 255, 0   ), '119' => array( 135, 255, 95  ),
	'120' => array( 135, 255, 135 ), '121' => array( 135, 255, 175 ),
	'122' => array( 135, 255, 215 ), '123' => array( 135, 255, 255 ),
	'124' => array( 175, 0,   0   ), '125' => array( 175, 0,   95  ),
	'126' => array( 175, 0,   135 ), '127' => array( 175, 0,   175 ),
	'128' => array( 175, 0,   215 ), '129' => array( 175, 0,   255 ),
	'130' => array( 175, 95,  0   ), '131' => array( 175, 95,  95  ),
	'132' => array( 175, 95,  135 ), '133' => array( 175, 95,  175 ),
	'134' => array( 175, 95,  215 ), '135' => array( 175, 95,  255 ),
	'136' => array( 175, 135, 0   ), '137' => array( 175, 135, 95  ),
	'138' => array( 175, 135, 135 ), '139' => array( 175, 135, 175 ),
	'140' => array( 175, 135, 215 ), '141' => array( 175, 135, 255 ),
	'142' => array( 175, 175, 0   ), '143' => array( 175, 175, 95  ),
	'144' => array( 175, 175, 135 ), '145' => array( 175, 175, 175 ),
	'146' => array( 175, 175, 215 ), '147' => array( 175, 175, 255 ),
	'148' => array( 175, 215, 0   ), '149' => array( 175, 215, 95  ),
	'150' => array( 175, 215, 135 ), '151' => array( 175, 215, 175 ),
	'152' => array( 175, 215, 215 ), '153' => array( 175, 215, 255 ),
	'154' => array( 175, 255, 0   ), '155' => array( 175, 255, 95  ),
	'156' => array( 175, 255, 135 ), '157' => array( 175, 255, 175 ),
	'158' => array( 175, 255, 215 ), '159' => array( 175, 255, 255 ),
	'160' => array( 215, 0,   0   ), '161' => array( 215, 0,   95  ),
	'162' => array( 215, 0,   135 ), '163' => array( 215, 0,   175 ),
	'164' => array( 215, 0,   215 ), '165' => array( 215, 0,   255 ),
	'166' => array( 215, 95,  0   ), '167' => array( 215, 95,  95  ),
	'168' => array( 215, 95,  135 ), '169' => array( 215, 95,  175 ),
	'170' => array( 215, 95,  215 ), '171' => array( 215, 95,  255 ),
	'172' => array( 215, 135, 0   ), '173' => array( 215, 135, 95  ),
	'174' => array( 215, 135, 135 ), '175' => array( 215, 135, 175 ),
	'176' => array( 215, 135, 215 ), '177' => array( 215, 135, 255 ),
	'178' => array( 215, 175, 0   ), '179' => array( 215, 175, 95  ),
	'180' => array( 215, 175, 135 ), '181' => array( 215, 175, 175 ),
	'182' => array( 215, 175, 215 ), '183' => array( 215, 175, 255 ),
	'184' => array( 215, 215, 0   ), '185' => array( 215, 215, 95  ),
	'186' => array( 215, 215, 135 ), '187' => array( 215, 215, 175 ),
	'188' => array( 215, 215, 215 ), '189' => array( 215, 215, 255 ),
	'190' => array( 215, 255, 0   ), '191' => array( 215, 255, 95  ),
	'192' => array( 215, 255, 135 ), '193' => array( 215, 255, 175 ),
	'194' => array( 215, 255, 215 ), '195' => array( 215, 255, 255 ),
	'197' => array( 255, 0,   95  ), '198' => array( 255, 0,   135 ),
	'199' => array( 255, 0,   175 ), '200' => array( 255, 0,   215 ),
	'202' => array( 255, 95,  0   ), '203' => array( 255, 95,  95  ),
	'204' => array( 255, 95,  135 ), '205' => array( 255, 95,  175 ),
	'206' => array( 255, 95,  215 ), '207' => array( 255, 95,  255 ),
	'208' => array( 255, 135, 0   ), '209' => array( 255, 135, 95  ),
	'210' => array( 255, 135, 135 ), '211' => array( 255, 135, 175 ),
	'212' => array( 255, 135, 215 ), '213' => array( 255, 135, 255 ),
	'214' => array( 255, 175, 0   ), '215' => array( 255, 175, 95  ),
	'216' => array( 255, 175, 135 ), '217' => array( 255, 175, 175 ),
	'218' => array( 255, 175, 215 ), '219' => array( 255, 175, 255 ),
	'220' => array( 255, 215, 0   ), '221' => array( 255, 215, 95  ),
	'222' => array( 255, 215, 135 ), '223' => array( 255, 215, 175 ),
	'224' => array( 255, 215, 215 ), '225' => array( 255, 215, 255 ),
	'227' => array( 255, 255, 95  ), '228' => array( 255, 255, 135 ),
	'229' => array( 255, 255, 175 ), '230' => array( 255, 255, 215 ),
	'232' => array( 8,   8,   8   ), '233' => array( 18,  18,  18  ),
	'234' => array( 28,  28,  28  ), '235' => array( 38,  38,  38  ),
	'236' => array( 48,  48,  48  ), '237' => array( 58,  58,  58  ),
	'238' => array( 68,  68,  68  ), '239' => array( 78,  78,  78  ),
	'240' => array( 88,  88,  88  ), '241' => array( 98,  98,  98  ),
	'242' => array( 108, 108, 108 ), '243' => array( 118, 118, 118 ),
	'245' => array( 138, 138, 138 ), '246' => array( 148, 148, 148 ),
	'247' => array( 158, 158, 158 ), '248' => array( 168, 168, 168 ),
	'249' => array( 178, 178, 178 ), '250' => array( 188, 188, 188 ),
	'251' => array( 198, 198, 198 ), '252' => array( 208, 208, 208 ),
	'253' => array( 218, 218, 218 ), '254' => array( 228, 228, 228 ),
	'255' => array( 238, 238, 238 )
);

function hex2rgb( $color ) {
	$color = ltrim($color, '#');

	if ( strlen( $color ) == 6 ) {
		$rgb = str_split($color, 2);
	} elseif ( strlen( $color ) == 3 ) {
		$rgb = array( $color[0] . $color[0], $color[1] . $color[1], $color[2] . $color[2] );
	} else {
		return false;
	}

	return array_map('hexdec', $rgb);

}

function nearest_color($hex) {
	global $CLUT;
	$ecolor = hex2rgb($hex);

	$data = array_map(function($color)use($ecolor){

		return intval(sqrt( 
			pow( $color[0] - $ecolor[0], 2 ) + 
			pow( $color[1] - $ecolor[1], 2 ) + 
			pow( $color[2] - $ecolor[2], 2 ) 
		));

	}, $CLUT);

	$data = array_flip($data);
	ksort($data);
	return current($data);
}

function nearest_color2($hex) {
	global $CLUT;
	$ecolor = hex2rgb($hex);
	
	$data = array_map(function($color)use($ecolor){

		return intval(( 
			abs( $color[0] - $ecolor[0]  ) + 
			abs( $color[1] - $ecolor[1]  ) + 
			abs( $color[2] - $ecolor[2]  ) 
		));

	}, $CLUT);

	$data = array_flip($data);
	ksort($data);
	return current($data);
}

function xdechex($int) {
	return str_pad(dechex($int), 2, "0", STR_PAD_LEFT);
}